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Updated: May 20, 2025

Author Spotlight: Understanding Microbe Adaptation Using Innovative Techniques for Exploring Thermophilic Evolution

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Published on: June 14, 2024

Protists exhibit community-level adaptation and functional redundancy under gradient soil salinity.

Seda Ozer Bodur¹, Solomon Oloruntoba Samuel², Muhammet Fatih Polat¹

¹Laboratory of Applied Protistology, Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan.

The Science of the Total Environment

|May 8, 2025

Summary

Soil salinity significantly impacts soil protists, altering their diversity but maintaining crucial ecosystem functions. This highlights the resilience of these organisms in paddy fields facing environmental stress.

Keywords:

Community-level adaptation Functional redundancy Paddy field Protists Soil salinity

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Published on: April 20, 2012

Area of Science:

Ecology
Soil Science
Microbiology

Background:

Soil salinization is a major climate change impact, particularly affecting lowland paddy fields.
Research on soil salinity's effects has largely overlooked protists, focusing instead on bacteria and fungi.
Understanding protist responses is crucial for assessing soil ecosystem health.

Purpose of the Study:

To investigate the direct impact of soil salinity on protist communities in paddy fields.
To differentiate salinity effects from other environmental variables using controlled experiments.

Main Methods:

Conducted in vitro experiments with controlled salinity gradients (0.1 to 12 dS m⁻¹) on paddy soil samples.
Validated in vitro findings with a field study examining soils affected by seawater intrusion.
Analyzed protist alpha and beta diversity and 18S rRNA gene abundance.

Main Results:

Soil salinity significantly affected protist alpha and beta diversity, with beta diversity showing strong clustering along salinity gradients.
Protist communities shifted compositionally, and 18S rRNA gene abundance decreased 10-fold under high salinity.
Despite compositional changes, protists maintained functional stability, preserving key ecosystem functions like predation and primary production.

Conclusions:

Protist communities are sensitive to soil salinity, exhibiting shifts in diversity and abundance.
Functional redundancy in protist communities ensures ecosystem stability despite salinity-induced compositional changes.
Protists play a vital role in maintaining soil ecosystem functions under salinity stress, emphasizing their importance in ecological research.